package com.xxxx.server.controller;

import com.google.code.kaptcha.impl.DefaultKaptcha;
import io.swagger.annotations.ApiOperation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
import java.io.IOException;

@RestController
public class CaptchaController {

    @Autowired
    private DefaultKaptcha defaultKaptcha;
    @ApiOperation(value="验证码")
    @GetMapping(value="/captcha",produces = "image/jpeg")
    public void captcha(HttpServletRequest request, HttpServletResponse response){
        //定义response输出类型为image/jpeg类型
        response.setDateHeader("Expires",0);
        //set standard HTTP/1.1 no-cache headers
        response.setHeader("Cache-Control","no-store,no-cache,must-revalidate");
        //set ie extended HTTP/1.1 no-cache headers(use addHeader)
        response.addHeader("Cache-Control","post-check=0,pre-check=0");
        //set standard http/1.0 no-chache header
        response.addHeader("Pragma","no-cache");
        //return a jpeg
        response.setContentType("image/jpeg");
        //-----------------生成验证码begin---------------
            //获取验证码文本内容
            String text=defaultKaptcha.createText();
            System.out.println("验证码内容："+text);
            //将验证码文本内容放入session
        request.getSession().setAttribute("captcha",text);
        //根据文本验证码内容创建图形验证码
        BufferedImage image=defaultKaptcha.createImage(text);
        ServletOutputStream outputStream=null;
        try{
            outputStream=response.getOutputStream();
            //输出流输出图片，格式为jpg
            ImageIO.write(image,"jpg",outputStream);
            outputStream.flush();
        }
        catch(IOException e){
            e.printStackTrace();
        }
       finally {
            if(outputStream!=null){
                try{
                    outputStream.close();
                }
                catch(IOException e){
                    e.printStackTrace();                }

            }

        }
        //-----------------生成验证码end---------------

    }


}
